If you select the voice and hit info (little circle with an i in the middle) it will describe the s. Art feature and how to use it. I am familiar with S Art on many instruments, although I seldom use it, but I can’t imagine what SArt can add to a piano voice, and I don’t have S Art on any of my piano voices so can’t look for you.
If you are a beginner as you state, you have a long way to go before you want to be worrying too much about the subtle voice features which S Art might add. Even a very skilled player, might not use them much in live playing. Maybe if you are trying to squeeze every bit of authenticity into a super sophisticated recording, but otherwise ……….
Mike